.login-box{
    position: absolute;
    top: 20%;
    width: 80%;
    left: 10%;
}
.login-box dl{
    display: flex;
    align-items: center;
    height:50px;
    border-bottom:1px solid #fff;
}
.login-box dl dt{
    width: 70px;
    color: #fff;
    flex-shrink: 0;
}
.buf_item dd input{
    width:100%;
    height:100%;
    font-size: 16px;
    background: black;
    color: #fff;
}
.btn{
    position: absolute;
    top: 50%;
    left: 10%;
    width:80%;
    height: 40px;
    color: #fff;
    font-size: 16px;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 5px;
}
.update{
    position: absolute;
    top: 58%;
    left: 10%;
    width:80%;
    display: flex;
    justify-content: space-between;
    font-size: 14px;
}